[LLVMbugs] [Bug 4082] New: bizarre array causes crash in target folder

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=4082

           Summary: bizarre array causes crash in target folder
           Product: tools
           Version: trunk
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: llvm-g++
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: nicholas at mxc.ca
                CC: llvmbugs at cs.uiuc.edu


Created an attachment (id=2898)
 --> (http://llvm.org/bugs/attachment.cgi?id=2898)
testcase (y.c, actually c++)

This crashes in llvm-g++ on 64-bit Linux but not 32-bit Linux.

$ llvm-g++ y.c
cc1plus: Constants.cpp:2239: static llvm::Constant*
llvm::ConstantExpr::getGetElementPtr(llvm::Constant*, llvm::Value* const*,
unsigned int): Assertion `Ty && "GEP indices invalid!"' failed.
y.c:30: internal compiler error: Aborted
Please submit a full bug report,
with preprocessed source if appropriate.
See <URL:http://llvm.org/bugs/> for instructions.

(gdb) bt
#0  0x00007f1847412095 in raise () from /lib/libc.so.6
#1  0x00007f1847413af0 in abort () from /lib/libc.so.6
#2  0x00007f184740b2df in __assert_fail () from /lib/libc.so.6
#3  0x0000000000ff4978 in llvm::ConstantExpr::getGetElementPtr (C=0x19abdc8, 
    Idxs=0x19b1be0, NumIdx=2) at Constants.cpp:2239
#4  0x00000000008a1e64 in TreeConstantToLLVM::EmitLV_ARRAY_REF (exp=0x19aa8a0)
    at
/usr/local/google/home/nlewycky/llvm/include/llvm/Support/TargetFolder.h:118
#5  0x00000000008a15a5 in TreeConstantToLLVM::Convert (exp=0x7f184731c780)
    at ../../src/gcc/llvm-convert.cpp:6421
#6  0x00000000008a36b0 in TreeConstantToLLVM::ConvertNOP_EXPR (
    exp=0x7f184731c7c0) at ../../src/gcc/llvm-convert.cpp:6583
#7  0x00000000008a28bb in TreeConstantToLLVM::ConvertArrayCONSTRUCTOR (
    exp=0x7f18473314b0) at ../../src/gcc/llvm-convert.cpp:6688
#8  0x0000000000890b52 in emit_global_to_llvm (decl=0x7f1847326c00)
    at ../../src/gcc/llvm-backend.cpp:1263
#9  0x000000000085f237 in assemble_variable () at varasm.c:1781
#10 0x00000000009102bb in cgraph_varpool_assemble_decl () at cgraphunit.c:940
#11 0x00000000009104e6 in cgraph_varpool_assemble_pending_decls ()
    at cgraphunit.c:958
#12 0x0000000000911fd1 in cgraph_optimize () at cgraphunit.c:1620
#13 0x00000000004aa9d6 in cp_finish_file () at decl2.c:3343
#14 0x0000000000415d99 in finish_file () at cp-lang.c:150
---Type <return> to continue, or q <return> to quit---
#15 0x000000000056f125 in c_common_parse_file () at c-opts.c:1305
#16 0x00000000008328a4 in toplev_main () at toplev.c:2287
#17 0x000000000057dbce in main (argc=2, argv=0x7fff5071ff28)
    at ../../src/gcc/llvm-main.cpp:38
(gdb) up 3
#3  0x0000000000ff4978 in llvm::ConstantExpr::getGetElementPtr (C=0x19abdc8, 
    Idxs=0x19b1be0, NumIdx=2) at Constants.cpp:2239
2239      assert(Ty && "GEP indices invalid!");
(gdb) p Ty
$1 = (const llvm::Type *) 0x0
(gdb) p C
$2 = (class llvm::Constant *) 0x19abdc8
(gdb) p C->dump()
@_ZN17_Foo_NameInfoInit6by_posE = global %0 zeroinitializer, align 4          
; <%0*> [#uses=1]

$3 = void
(gdb) up
#4  0x00000000008a1e64 in TreeConstantToLLVM::EmitLV_ARRAY_REF (exp=0x19aa8a0)
    at
/usr/local/google/home/nlewycky/llvm/include/llvm/Support/TargetFolder.h:118
118         return Fold(ConstantExpr::getGetElementPtr(C, IdxList, NumIdx));
(gdb) p IdxList
No symbol "IdxList" in current context.
(gdb) p NumIdx
No symbol "NumIdx" in current context.
(gdb) up
#5  0x00000000008a15a5 in TreeConstantToLLVM::Convert (exp=0x7f184731c780)
    at ../../src/gcc/llvm-convert.cpp:6421
6421                                        ConvertType(TREE_TYPE(exp)));


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